Why We Like The Garmin Edge 840 Solar Bike Computer
The Garmin Edge 840 Solar Bike Computer brings all of the features we love about the Edge 840 with the unique addition of solar charging. When charging in direct sunlight, our battery will last up to 60 hours, adding up to 25 minutes per hour while in battery saver mode to allow longer rides. When used with a compatible heart rate monitor or power meter, we are provided with adaptive coaching, personalized workouts, and stamina insights to help us gauge how much is left in our tank. Whether riding on the road, gravel, or deep in the woods on our favorite dirt trail, the integrated multi-band GNSS technology ensures we stay on the path with superior location accuracy.
Details
- The same Edge 840 we know and love with the addition of solar charging
- Battery life lasts up to 60 hours when charging in direct sunlight
- Responsive touch screen and button controls combine for simple use
- Personalized insights when connected to a power meter or HR monitor
- GNSS multi-band technology keeps us riding through dense trees
- Syncs to the Garmin Connect app to share with Strava, TrainingPeaks, etc
- Item #GRMF06J
- Housing Material
- silicone
- Clock
- yes
- Wireless
- yes
- Backlight
- yes
- Water-Resistant
- IPX7
- Battery Type
- Lithium ion cell contained in equipment
- Battery Life
- [demanding use] up to 32 hours, [battery saver mode] up to 60 hours
- Low Battery Indicator
- yes
- Mount Type
- out-front mount, standard mount
- Includes
- Edge 840 Solar, out-front mount, standard mount, tether, USB-C cable, documentation
- Dimensions
- 2.3 x 3.4 x 0.8in
- Face Size
- 2.6in (diagonal)
- Claimed Weight
- 84.9g (3.0oz)
- Manufacturer Warranty
- limited
- Activity
- cross-country, enduro, gravel, road cycling, trail
Reviews
Q&A
What do you think about this product?
Overall Rating
4 based on 91 ratings
Review Summary
Here's what customers have to say
The bike computer offers a range of features, including connectivity, touchscreen, and solar charging, which is seen as a valuable addition by many users. The device is praised for its accuracy, battery life, and data tracking capabilities. However, some users have experienced issues with syncing activities, bugs, and finding the setup and use a bit overwhelming initially. Overall, the product is viewed as a significant upgrade over previous models, with a mix of positive and negative reviews.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageAugust 18, 2025
Faster than my 830
I bought this recently to replace a lost 830. Although it is faster (processing) I don't like it as much. Had a few glitches with it - get prompts that don't allow you to complete what you were doing and at least once, I ended up in a loop that took dozens of tried to get past and shut down the device to start over. I hope I get used to it and come to like it as much as mt 830.
Originally reviewed on Garmin
August 15, 2025
Solar benefit doesn’t outweigh darker screen
I have had previous Edge models run out of juice on Century rides so solar seemed attractive, but I ride early morning/late afternoon a lot more than all day long and in fading light the screen is too dark. Lots of added features, but none that add huge value
Originally reviewed on Garmin
August 6, 2025
Not Happy
I have been using the Garmin 840 for the past year and a half. I could say there are some good features in this bicycle computer. However, the screen is always hard to read. It's always kind of dark. It is not very clear. That is my only problem with this bicycle computer. One of the things is that if I make it where it's really bright, the battery does not last as much as advertised.
Originally reviewed on Garmin
July 29, 2025
840 Solar
Replaced my Garmin 520, love the 840 solar. Battery life is excellent, especially w/solar technology. Still learning to navigate the screens love the touch screen it is awesome. This product is weel worth the money.
Originally reviewed on Garmin
July 7, 2025
840 solar
Overall a great computer but still glitchy. Grade and elevation are definitely Off. Sensor glitch, I had to do a hard reset and reconnect all the sensors.
Originally reviewed on Garmin
June 29, 2025
Great upgrade for me
I've used a garmin 820 for several years now and have been happy with it. But decided it was time to upgrade so after reading many reviews I went with the 840 solar. My rides are never too long but I thought the solar part would be a good back up in case I was out longer than usual. No issues so far and I'm happy with the purchase! Many thanks Garmin
Originally reviewed on Garmin
June 16, 2025
Solar is amazing
840 solar is a game changer and in a smaller size computer compared to the 1030 or 40 etc. Love it. Does everything I need and more. Super simple set up from my Garmin profile. Just copied everything from my 530. Simple!
Originally reviewed on Garmin
June 8, 2025
A lot more tools and features
So far so good. Really like some of the new functionality. Still learning and getting used to using the new features
Originally reviewed on Garmin
June 6, 2025
Returned Garmin 840 Solar
My Garmin 840 experienced persistent issues from the beginning, frequently freezing during use. On multiple occasions, I was forced to restart the ride on the device. Notably, these problems only occurred when using the navigation feature—which is essential for my bikepacking plans this summer, as reliable navigation is the primary reason I purchased a bicycle computer.
Originally reviewed on Garmin
May 9, 2025
Perfect bike computer
This is an upgrade for me from an older edge and it is amazing. My older Garmin was great when I first got it but after many years it started lagging behind technology. This device has all the whistles and with the solar option it really extends my ride time for ultra long rides. Highly recommend for anyone who needs reliability or all the techie stuff.
Originally reviewed on ExpertVoice.com
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